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Share-Based Compensation - 2017 Equity Incentive Plan (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2022
USD ($)
day
shares
Mar. 31, 2021
USD ($)
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant (in shares) | shares 1,015,317    
Share-based compensation expense $ 3,128 $ 1,666  
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 1,792 801  
General and administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1,336 $ 865  
2017 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant (in shares) | shares 533,779    
Ordinary shares | 2017 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) | shares 13,601,246    
Share options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 3,500    
Options vested due to accelerated vesting (in shares) | shares 866,268    
Share options | Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1,400    
Share options | General and administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 2,100    
Share options | 2017 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Share options | 2017 Equity Incentive Plan | Options Granted Before June 30, 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Award vesting percentage (in percent) 25.00%    
Vesting percentage if listed on a stock exchange 100.00%    
Share options | 2017 Equity Incentive Plan | Share-based Payment Arrangement, Tranche one      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage (in percent) 33.30%    
Share options | 2017 Equity Incentive Plan | Share-based Payment Arrangement, Tranche one | Grant Date June 30, 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Award vesting percentage (in percent) 25.00%    
Share options | 2017 Equity Incentive Plan | Share-based Payment Arrangement, Tranche two | Grant Date June 30, 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Award vesting percentage (in percent) 75.00%    
Share options | 2017 Equity Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Share options | 2017 Equity Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Restricted Stock Units (RSUs) | 2017 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Award vesting percentage (in percent) 25.00%    
Restricted Stock Units (RSUs) | 2017 Equity Incentive Plan | Share-based Payment Arrangement, Tranche one | Grant Date June 30, 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage (in percent)     25.00%
Percentage amount closing price is higher than listing price 20.00%    
Expiration period     1 year
Threshold consecutive trading days | day 5